Drying and calcining kiln.



PA-TENTED MAR 1, 1904.

No. 753,624.v

c. E. IOKBTT. DRYING AND GALCINING KILN.

APPLICATION FILED SEPT. 18. 1903.

z SHEETS-SHEET 1.

N0 MODEL.

A TTOHNE Y PATENTBD MAR. 1, 1904.

c. E. PICKETT. DRYING AND GALCINING KILN.

APPLICATION FILED SEP'I. 18. 1903.

2 SHEETS-SHEET 2.

N0 MODEL.

lmuuulllm vIO UNITED VSTATES Patented March 1, 1904.

PATENT OFFICE.

. DRYING. AND CALCINlNe. KILN.

SPECIFICATION forming' part of Letters Patent No. 753,624, dated March 1, 190.4. Application led September 18, 1993. Serial No. 173,66()l (No model.)

To all whom it may concern: v

Be it known that I, CHARLES EDWIN PICKETT,

a citizen of the United States, and a resident of Bayonne, in the county of Hudson and State ofNew Jersey, have invented certain new and .a driving-shaft F2, which latter carries a bevelpinion F3, that meshes with a bevel-gear F2,

useful Improvements in Drying and Calcining Kilns, of which the followingis a specication.

This invention relates'to drying and calcining kilns, and has for its object a rotary kiln in which the material to be treatedand the means for drying and calcining the'same are introduced into diiferent chambers, thereby avoiding the mixture ofthe products of combustion and gases of the fuel with the matel rial to be treated.

My kiln is particularly adapted for drying and calcining borate of lime, although it may be employed for other substances.

My invention is characterized by a kiln com posed of an outer and inner cylinder, obtaining thereby a chamber with the interior of the inner cylinder and a second chamber with the annular space between the cylinders. By introducing the material to be handled into the interior of the inner cylinder and heat into the annular chamber between the cylinders means are provided by which the temperature of the material to be handled is,L easily controlled. Y

Referring to the drawings, Figure l represents an elevation of the-kiln withY its appurtenances. Fig. 2 shows a top viewvof Fig. l.

Fig. 3 is a partial section of Fig. l on the line Fig. 4 represents an enlarged section of Fig. l on the line Fig. 5 shows enlarged fragmentary section of Fig. 2 on the line'x2 m2. Fig. 6 represents an enlarged plan view of hopper-valve and appurtenances.

The kiln is comprised of the outer cylinder A, having the lire-brick lining A', on the in,- side of which there is supported the inner cylinder B by means of the brackets C, which form rigid connections between the cylinders, at one end thereof, and the guide-lugs D D' ,which support the inner cylinder, being only bolted, respectively, to the outercylinder A and to bonnets A2, constituting combined guides and supports for the inner cylinder, allowing the cylinders to expand and contract when Subj ected to various degrees of temperature. Bearing-rings Eare fastened around the outer cylinder A and are supported in rollers E' ,carried in frames E2, which latter are pivoted by means of the pins E3, supported in bearings E4.

Tight' and loose pulleys F F' are carried on supported on a shaft F5. c The latter shaft carries a pinion G, which meshes with a spurgear G', and on the-shaft G2 of the spur-gear G' there is secured the pinion H, that meshes with the spur-gear H', which latter is secured lar ring I', carried on the casing I, bears against the said bearing B2. A vapor-escape pipe K extends from the casing I to the outside ofthe chamber J.

A hopper L is located on top of the box J and its outlet-pipe L is connected to the casing I. A hanger I2 liexibly supports the casing I. On the inside of the casing I there is located the screw conveyer M, having a shaft m, on'which is secured a pulley M2 for driving the same.

At the lower end of the cylinders is located a movable head O, which is supported on a truck, with the truck-wheels O' arranged on tracks O2. forms a chamber O4 therein and from the bottom of the said chamber there extends the pipe O5 with ange O6, which latter fits over a flange O2, carried on a pipe O8, that connects with a horizontal casing O9, having a screw conveyer O1. Oil-burners P extend through theV head O and into the annular space or chamber between the two cylinders A and B.

Referring to the guide-lugs D and D', the latter are located in pairs between the two cylinders and the former are bolted directly to the shell of the outer cylinder A, while each of the latter is secured to a bonnet A2, which is bolted over an opening A3 in the said shell,

A partition O3 in the said head O l head B' of the inner cylinder B, and an angu- IOO the opening being large enough to allow the head Z of the guide-lug to pass through, the foot ZZ' being made sufficiently long to prevent it dropping through. This construction is advantageous when for any reason the free end of the inner cylinder is jammed between the lugs D D', as by loosening the bonnets A3 the said lugs D' can be easily loosened from both of the cylinders.

The hopper L has a valve Z, -which is actuated by an arm Z', connected to an arm Z2 `of an eccentric carried on the shaft Z3. The latter is driven by means of the pulley Z2, belted with the pulley f on the shaft F2. A gate Z5 controls the opening from the hopper.

The outer cylinder A has the longitudinal straps a for its longitudinal seams and the straps CZ' for its cross-seams.

The inner cylinderBis composed of sections joined by the angular flanges Z' and Z', which latter are joined by the bolts Z2 and the internal straps Z2. The iianges Z', with their bolts Z2, allow the easy removal of the end section of the inner cylinder B. A

To operate my invention, the head P, with its burners, is placed in position, the shaft F2 being driven from a suitable source of power. The material is introduced into the hopper L, and the valve Z allows it to drop through the pipe L' into the casing I in the requisite quantity. The conveyer M conducts the material through the casing I and into the inner cylinder B, which latter turning and being inclined conducts it to its discharging end. The material then drops into the chamber O4 of the head O, where it is led through the piping O5 O8 into the casing O2 and to the conveyerOw, the latter carrying it to any desired point. The heat. from burners P dries the material as it enters the inner cylinder B and calcines it before leaving the same, the ianges Z and Z', preventing a too rapid travel through the kiln. 'Ihe gases and vapors generated by heating the material pass up the vapor-pipe K, and the gases and products of combustion from the fuel pass up the chimney J', thereby preventing the deterioration of the material by the latter.

Having described my invention, I claim- 1. In akiln, the combination of an outer cylind er and an inner cylinder, a smoke-box at one end of the cylinders, a chimney extending from the said box, va conveyer leading to the inside of the inner cylinder, a hopper with piping leading to the said conveyer, a casing for the conveyer and a vapor-escape pipe leading from the casing, means to rotate the conveyer,means to rotate the cylinders, and means to heat the annular space between the cylinders.

2. In a rotary kiln, the combination of an outer cylinder and an inner cylinder, brackets to clamp the cylinders together at one end, combined guides and supports secured to the outer cylinder to support the inner cylinder therein, allowing the cylinders to expand and contract, a movable head at the discharge end of the kiln, trucks for the said head, oil-burners passing through the head into the space between the cylinders, means to rotate the cylinders, means to introduce material into the inner cylinder in specified quantities, means to discharge the products of combustion, and independent means to discharge the vapor and gases generated from the heating of the material, so as to separate the vapor and gases from the said material, and the gases from the products of combustion.

3. In a rotary drying-kiln, the combination of an outerl cylinder, and an inner cylinder therein, flanges on the inner cylinder to secure sections thereof together, and an internal flange at the discharge end of the inner cylinder, brackets securing the two cylinders together at the inlet ends thereof, combined guides and supports fastened to the outer cylinder supporting the inner cylinder, said com bined guides and supports fastened to a bonnet detachably secured to the outer cylinder, for supporting the inner cylinder, means to introduce a material into the inner cylinder, means to heat the chamber between the two cylinders, means td lead ofi the products `of combustion, means to lead oif the gases generated when heating the material.

4. In a rotary drying-kiln, the combination of an outer cylinder and an inner cylinder therein, a conveyer connected to the inlet end of the inner cylinder, a casing for the said conveyer, a hopper arranged to discharge into the said casing, an opening in the hopper, `a gate for the said opening, a valve in the bottom of the hopper, means to actuate the valve, means to rotate the cylinders, and means to heat the space between the cylinders.

Signed at Bayonne, in the county of Hudson and State of New Jersey, this 1st day of September, A. D. 1903.

CHARLES EDWIN PICKETT.

Witnesses:

H. C. CoLvILLE, HARDING.

ICO

IOS 

